Jeffrey c



(No Model J. O. BOYLE.

ELEGTRIOTEMPERATURE INDICATOR.

Patented Dec. 13

W a/ W 5 PETERS. PhuhrLil UNITED STATES PATENT OFFIC I JEFFREY C. BOYLE, OF BROOKLYN, ASSIGNOR TO DANIEL HASTINGS CRAIG,

AGENT, OF NEW YORK, N. Y.

' ELECTRIC TEMPERATURE-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 374,581, dated December 13, 1887.

Application filed May 7, 1887. Serial No. 237,434. (No model.)

To all whom it may concern:

Be it known that I, JEFFREY CRow BOYLE, a subject of the Queen of Great Britain, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Thermometric Alarms, of which the following is a specification.

My invention relates to thermometric alarms or signaling apparatus for use in breweries,

. together with a diagram of the electric circuits.

- In the drawing, the numeral 1 designates a casing or box of any suitable character,within which the parts hereinafter described may be inclosed for safety. v Within said easing,which is open in front for full exposure to the air, is mounted a mercury-bulb, 2, having a neck or stem, 3, in which the mercury may rise and fall with an increasing or decreasing temperature. This bulb is supported by straps 4, or in any other suitable manner. Within the upper portion of the casing is arranged a quadrant-plate, 5, having a graduated sealeplate, 5, of any suitable character, which will show or indicate the variations in atmospheric temperature.

Upon an arbor, 6,'suitably arranged with relation to the quadrant and bulb, is mounted an index-hand, 7, the point whereof moves upon the quadrant scale. The arbor 6 is 5 located at the center, from which the quadrant 5 is struck, and this center is arranged over the bulb 2 and a little to one side of the axial line of the neck 3. The index 7 is provided with a weight, 8, which balances the weight of the hand, and the arbor of the latter is supported by an insulated forked bracket, 7

IVithin the neck 3 of the bulb isintroduced a glass float, 9, resting upon mercury and rising and falling freely with it. Through this float passes centrally and longitudinally a platinum wire, l0, which depends below the lower end of the tube and extends up through the open end of the neck 3 to the pointer or index 7, to which it is connected bya pin, 11, covered with platinum or other conducting metal, and around which the connected end of the wire 10 is looped in such manner that it is free to turn thereon. It will readily be seen that as the mercury rises and falls with change of temperature the pointer 7 will, when the parts are properly arranged, indicate such variations upon the graduated plate 5.

At or near each end of the quadrant 5 is placed a binding-post, 12, on which is pivotally mounted an arm, 13, which may be set at any desired point by simply loosening the binding-screw 14 and turning the arm. Upon the free end of said arm is jointed a circuitcloser, 15, having its extremity bent over or otherwise formed so as to overlie the scaleplate 5 and intersect the path of the index. The parts of each binding-post are precisely similar in all respects. The lower end of the bulb is drawn out to form a nipple, 16, in which is sealed a conducting-wire, 17. This wire passes to a binding post, 18, and connection is thence made to thezincs of aLeclanch battery, 19.

From each of the binding-posts 12 conneotion is made by wires 20 and 21, respectively, with the other pole of the battery 19,a call-bell, 22, being interposed in one circuit, and asimilar call, 23, in the other. Proper insulation for the several parts is provided in the ordinary way.

To aid in giving adjustment to the circuitbreakers 15, I mount upon the quadrant 5 a plate, 24, of rubber or other non-conducting substance, and form therein at suitable intervals holes or openings 25, with which pins or detents 26 upon the ends of the circuit-breakers will engage. This construction aids in giving positive adjustment to the parts and in securing certainty of action.

The scale-plate 5 is mounted upon the insu lated or rubber plate 24, and upon the quadrant-plate 5, I arrange symbols, such as F,

too

to indicate freezing; '1, temperate; B, bloodheat, &c. The rubber plate 24 is formed to pro ect somewhat in front of the scale-plate and quadrant, and forms the bed or platform on which the circuit closers may be moved and the index vibrated.

If desired, the bells may be located at dif-- given automatically of variations of tempera,

ture within any limits, according to the ad ustment of the circuit breakers upon the plate 24. Articles of a perishable nature which require low temperatures for their preservation, as well as those substances which, if exposed to certain temperatures, will be chilled or destroyed, may thus be guarded. In hospitals also, and in manufactories where aperi'ectly even or nearly even temperature is necessary, the device will be of especial service.

Upon the extremities of the circuit-closers I mount platinum contact tips, which, being free from oxidation, will be certain to close the circuit the instant the index comes in contact.

I have stated that the casing lis open to the a1r; but in most cases it will be preferable to provide a sliding or swinging glass front, which will give access to the case and then enable it to be closed to prevent any tampering with the parts, at the same time permitting a clear view of the apparatus.

By extending the platinum wire below the bottom of the glass float its end is always buried in the mercury, and a current will never be interrupted by any atmospheric effects upon the mercury, as might happen if the wire only made contact with the surface of said mercury. I extend the wire about threeeighths of an inch below the end of the glass float for this purpose.

I use the vibrating alarm-calls,and the purpose is to produce a continuous sound of either the high or low alarm, the bell sounding until the temperature is regulated sufficiently to break the circuit by the rise or fall ofthe mercury and the corresponding movement of the index on the quadrant plate.

Having thus described my invention,whatI claim is- 1. In a thermometric alarm, the combination, with a mercury-bulb having a glasssealed wire in a nipple drawn out on said bulb, of a glass float carrying a conducting-wire depending into the mercury, ascale-plate, and a weight-balanced index traveling thereon, the float-wire being connected thereto, substantially as described.

2. In a thermometrie alarm, the combination, with an index or pointer formed of conducting material traveling on a graduated scale and operated by the rise and fall of mercury in a glass bulb, of circuit-closers jointed to arms pivotally mounted on binding-posts at or near each end of the scale-plate, substantially as described.

3. In a thermometric alarm,'a scale-plate havinga rubber edge-plate provided with perforations or depressions at intervals corresponding with one or more graduations on the plate, circuit-closers moving on said rubber plate and having detents engaging said perforations, and binding'posts to which said circuitbreakers are pivotally connected by a jointed arm, substantially as described.

4. The combination, with an electric generator, of a mercury-bulb, an index movable to and fro by the expansion and contraction of the mercury therein, circuit-closers having platinum contact-points and adjustable upon a scale over which the index moves, a float resting on the mercury, a wire carried by said float to operate the index, and a wire sealed in the bulb and connected to one pole of the generator, the circuitclosers being connected to the other pole, substantially as described;

5. The combination, with the scale-plate, of the projecting rubber plate, the quadrantplate to which said parts are attached, the binding-posts at or near each end of said quadrant,the arms pivotally mounted on said posts, the circuitc osers jointed to the extremities of said arms, and an index electrically connected to one pole of the battery, the binding-posts being connected to the other pole, substantially as described.

In testimony whereof I afflx my signature in presence of two witnesses.

JEFFREY O. BOYLE.

Witnesses:

J. B. BROWN, GEo. T. PINOKNEY. 

